// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:  Ceiling aninmation (lowering, crushing, raising)
//
//-----------------------------------------------------------------------------

#include "z_zone.h"
#include "doomdef.h"
#include "p_local.h"

#include "s_sound.h"

// State.
#include "doomstat.h"
#include "r_state.h"

// Data.
#include "sounds.h"

//
// CEILINGS
//

ceiling_t*      activeceilings[MAXCEILINGS];

//
// T_MoveCeiling
//

void T_MoveCeiling (ceiling_t* ceiling)
{
    result_e    res;

    switch(ceiling->direction)
    {
      case 0:
        // IN STASIS
        break;
      case 1:
        // UP
        res = T_MovePlane(ceiling->sector,
                          ceiling->speed,
                          ceiling->topheight,
                          false,1,ceiling->direction);

        if (!(leveltime&7))
        {
            switch(ceiling->type)
            {
              case silentCrushAndRaise:
                break;
              default:
                S_StartSound((mobj_t *)&ceiling->sector->soundorg,
                             sfx_stnmov);
                // ?
                break;
            }
        }

        if (res == pastdest)
        {
            switch(ceiling->type)
            {
              case raiseToHighest:
                P_RemoveActiveCeiling(ceiling);
                break;

              case silentCrushAndRaise:
                S_StartSound((mobj_t *)&ceiling->sector->soundorg,
                             sfx_pstop);
                // Falls through.
              case fastCrushAndRaise:
              case crushAndRaise:
                ceiling->direction = -1;
                break;

              default:
                break;
            }

        }
        break;

      case -1:
        // DOWN
        res = T_MovePlane(ceiling->sector,
                          ceiling->speed,
                          ceiling->bottomheight,
                          ceiling->crush,1,ceiling->direction);

        if (!(leveltime&7))
        {
            switch(ceiling->type)
            {
              case silentCrushAndRaise: break;
              default:
                S_StartSound((mobj_t *)&ceiling->sector->soundorg,
                             sfx_stnmov);
            }
        }

        if (res == pastdest)
        {
            switch(ceiling->type)
            {
              case silentCrushAndRaise:
                S_StartSound((mobj_t *)&ceiling->sector->soundorg,
                             sfx_pstop);
                // Falls through.
              case crushAndRaise:
                ceiling->speed = CEILSPEED;
                // Falls through.
              case fastCrushAndRaise:
                ceiling->direction = 1;
                break;

              case lowerAndCrush:
              case lowerToFloor:
                P_RemoveActiveCeiling(ceiling);
                break;

              default:
                break;
            }
        }
        else // ( res != pastdest )
        {
            if (res == crushed)
            {
                switch(ceiling->type)
                {
                  case silentCrushAndRaise:
                  case crushAndRaise:
                  case lowerAndCrush:
                    ceiling->speed = CEILSPEED / 8;
                    break;

                  default:
                    break;
                }
            }
        }
        break;
    }
}

//
// EV_DoCeiling
// Move a ceiling up/down and all around!
//
int
EV_DoCeiling
( line_t*       line,
  ceiling_e     type )
{
    int         secnum;
    int         rtn;
    sector_t*   sec;
    ceiling_t*  ceiling;

    secnum = -1;
    rtn = 0;

    //  Reactivate in-stasis ceilings...for certain types.
    switch(type)
    {
      case fastCrushAndRaise:
      case silentCrushAndRaise:
      case crushAndRaise:
        P_ActivateInStasisCeiling(line);
      default:
        break;
    }

    while ((secnum = P_FindSectorFromLineTag(line,secnum)) >= 0)
    {
        sec = &sectors[secnum];
        if (sec->specialdata)
            continue;

        // new door thinker
        rtn = 1;
        ceiling = Z_Malloc (sizeof(*ceiling), PU_LEVSPEC, 0);
        P_AddThinker (&ceiling->thinker);
        sec->specialdata = ceiling;
        ceiling->thinker.function.acp1 = (actionf_p1)T_MoveCeiling;
        ceiling->sector = sec;
        ceiling->crush = false;

        switch(type)
        {
          case fastCrushAndRaise:
            ceiling->crush = true;
            ceiling->topheight = sec->ceilingheight;
            ceiling->bottomheight = sec->floorheight + (8*FRACUNIT);
            ceiling->direction = -1;
            ceiling->speed = CEILSPEED * 2;
            break;

          case silentCrushAndRaise:
          case crushAndRaise:
            ceiling->crush = true;
            ceiling->topheight = sec->ceilingheight;
            // Falls through.
          case lowerAndCrush:
          case lowerToFloor:
            ceiling->bottomheight = sec->floorheight;
            if (type != lowerToFloor)
                ceiling->bottomheight += 8*FRACUNIT;
            ceiling->direction = -1;
            ceiling->speed = CEILSPEED;
            break;

          case raiseToHighest:
            ceiling->topheight = P_FindHighestCeilingSurrounding(sec);
            ceiling->direction = 1;
            ceiling->speed = CEILSPEED;
            break;
        }

        ceiling->tag = sec->tag;
        ceiling->type = type;
        P_AddActiveCeiling(ceiling);
    }
    return rtn;
}

//
// Add an active ceiling
//
void P_AddActiveCeiling(ceiling_t* c)
{
    int         i;

    for (i = 0; i < MAXCEILINGS;i++)
    {
        if (activeceilings[i] == NULL)
        {
            activeceilings[i] = c;
            return;
        }
    }
}

//
// Remove a ceiling's thinker
//
void P_RemoveActiveCeiling(ceiling_t* c)
{
    int         i;

    for (i = 0;i < MAXCEILINGS;i++)
    {
        if (activeceilings[i] == c)
        {
            activeceilings[i]->sector->specialdata = NULL;
            P_RemoveThinker (&activeceilings[i]->thinker);
            activeceilings[i] = NULL;
            break;
        }
    }
}

//
// Restart a ceiling that's in-stasis
//
void P_ActivateInStasisCeiling(line_t* line)
{
    int         i;

    for (i = 0;i < MAXCEILINGS;i++)
    {
        if (activeceilings[i]
            && (activeceilings[i]->tag == line->tag)
            && (activeceilings[i]->direction == 0))
        {
            activeceilings[i]->direction = activeceilings[i]->olddirection;
            activeceilings[i]->thinker.function.acp1
              = (actionf_p1)T_MoveCeiling;
        }
    }
}

//
// EV_CeilingCrushStop
// Stop a ceiling from crushing!
//
int     EV_CeilingCrushStop(line_t      *line)
{
    int         i;
    int         rtn;

    rtn = 0;
    for (i = 0;i < MAXCEILINGS;i++)
    {
        if (activeceilings[i]
            && (activeceilings[i]->tag == line->tag)
            && (activeceilings[i]->direction != 0))
        {
            activeceilings[i]->olddirection = activeceilings[i]->direction;
            activeceilings[i]->thinker.function.acv = (actionf_v)NULL;
            activeceilings[i]->direction = 0;           // in-stasis
            rtn = 1;
        }
    }

    return rtn;
}
